Diamond polishers lose their sparkle
9 March 2014 Last updated at 00:19 GMT
An estimated eight out of 10 of the world's diamonds have been cut and polished in Surat in the north-west Indian state of Gujarat.
Yogita Limaye visits the town - where security seems non-existent - and hears how businesses are worrying over the threat from China and volatile currency.
Watch India Business Report